How to implement line sorting, uniquifying and counting function in emacs?

[gnuist006]

In shell you can do this:

   cat file | sort | uniq -d | wc 

to count the repeated lines. You can also do

   cat file | sort | uniq -u | wc

to count the unique lines.

Sometimes I have to do this on windows platform where I do have emacs.
This means that I cannot escape to shell and that route is not available.

Lisp has sort-lines, but no uniq -u or uniq -d available. Also I do not
know the equivalent to wc.

This is where some help is requested. I think that this is not only a
problem of lisp programming, but also algorithms. Which group has this
kind of expertise?

Cheers!
gnuist